Dear SPM experts,
I’m now using sad and neutral face processing in my study, according to the SPM8 processingman(p.21), contrasts selected should be a comparison at the 1st level such as S>N in my study, for paired t test and 2 sample t test, group-by-time interaction seems not feasible in t tests, will this lead to any bias in the final data? Could I compare S>N contrast and conduct group-by-time interaction by using flexible factorial design?
Any advice will be much appreciated.
Best regards,
Ben Hung
LKS Faculty of Medicine
The University of Hong Kong
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